Note 4 - Credit Arrangements (Detail) (USD $)	Sep. 30, 2012	Jun. 30, 2012	Sep. 30, 2011
Line of Credit Facility, Maximum Borrowing Capacity	$ 35,000,000
Line of Credit Facility, Remaining Borrowing Capacity	1,000,000
Letters of Credit Outstanding, Amount	794,000
Line of Credit Facility, Amount Outstanding	24,380,000	11,810,000	23,604,000
Debt Instrument, Basis Spread on Variable Rate	4.25%
Adjusted Downward [Member]
Debt Instrument, Basis Spread on Variable Rate	3.75%
Includes Revolver and Letters of Credit [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 35,000,000